Fixes test_multiple_filters filters definition
Fixes test_multiple_filters filters definition

This test contained an invalid filter, which was
simply being ignored by both driver and
controller.

This patch fixes this bug and add a test to show
invalid filters are ignored.

Closes-Bug: #1424749

Change-Id: I05ab123717b49bcb47ca676e55040818c1451d71

roopali8/keystone,rushiagr/keystone,dstanek/keystone,takeshineshiro/keystone,dims/keystone,maestro-hybrid-cloud/keystone,klmitch/keystone,jonnary/keystone,jumpstarter-io/keystone,ilay09/keystone,rajalokan/keystone,mahak/keystone,jumpstarter-io/keystone,rajalokan/keystone,cernops/keystone,mahak/keystone,dstanek/keystone,openstack/keystone,jamielennox/keystone,ajayaa/keystone,openstack/keystone,ajayaa/keystone,mahak/keystone,nuxeh/keystone,roopali8/keystone,idjaw/keystone,promptworks/keystone,jumpstarter-io/keystone,promptworks/keystone,maestro-hybrid-cloud/keystone,vivekdhayaal/keystone,nuxeh/keystone,himanshu-setia/keystone,jamielennox/keystone,cernops/keystone,klmitch/keystone,jonnary/keystone,idjaw/keystone,vivekdhayaal/keystone,takeshineshiro/keystone,openstack/keystone,vivekdhayaal/keystone,rushiagr/keystone,rushiagr/keystone,rajalokan/keystone,dstanek/keystone,himanshu-setia/keystone,ilay09/keystone,dims/keystone,nuxeh/keystone,ilay09/keystone,promptworks/keystone